3. He's too arrogant to realize what a dumb ass he is.

4. I doubt he realizes it

but lately he's the gift that just keeps on giving each and every day.

The problem he shares with a lot of lefties is that they are convinced they are the smartest people in the room all the time. Reality would indicate something else entirely, Acosta is just not sharp enough to recognize his own limitations. Again he shares that with a great many lefties, and more than a few on the right. In our modern era of instant Google topic knowledge everyone thinks they are and expert on all manner of things they never studied, never were properly educated about and actually don't truly understand. It makes for daily entertainment for those of us not bound by party loyalty, and thus not bound to repeat inanity each and every day.